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Method for advanced treatment of coking wastewater

A coking wastewater and advanced treatment technology, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as poor results, failure to meet national discharge standards, high treatment costs, etc. problems, to achieve the effect of benefiting redox reaction, reducing COD and chroma, and strong coagulation adsorption

Inactive Publication Date: 2012-08-08
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, after secondary biochemical treatment of coking wastewater, the concentration of COD, total phenols, and ammonia nitrogen pollutants in the effluent is still high, and the color is dark, which cannot meet the national discharge standards. Therefore, advanced treatment of coking wastewater is necessary
The existing methods for the advanced treatment of coking wastewater mainly include flocculation, adsorption, membrane separation, chemical oxidation, etc. These methods have their own advantages and disadvantages, either the one-time investment is too large, the treatment cost is high, or the process is complicated and the effect is not good. , it is difficult to meet the emission standards and achieve satisfactory results

Method used

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  • Method for advanced treatment of coking wastewater
  • Method for advanced treatment of coking wastewater
  • Method for advanced treatment of coking wastewater

Examples

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Effect test

Embodiment 1

[0027] Example 1: Take some scrap iron filings, soak them with dilute sulfuric acid to remove oxides on their surfaces, then soak them in dilute NaOH solution to remove oil stains on their surfaces, and then fully wash the iron filings with clean water. Crush the coke into a particle size close to that of iron filings, take the processed iron filings, and then mix them evenly according to the ratio of iron filings and coke at a ratio of 10:1 (volume ratio), and pack them into a column. The coking wastewater after the secondary biochemical treatment enters the acidification treatment tank, where concentrated H 2 SO 4 Adjust the pH of the solution to about 3, let it settle, and the supernatant enters the flocculation tank, and add flocculant FeCl at 3g / L 3, let it settle down, and the supernatant enters the high-level water tank in a countercurrent manner, that is, water enters from the bottom of the column, and the water exits from the upper part, and adjust the flow rate of t...

Embodiment 2

[0028] Example 2: Take some scrap iron filings, soak them with dilute sulfuric acid to remove oxides on their surfaces, then soak them in dilute NaOH solution to remove oil stains on their surfaces, and then fully wash the iron filings with clean water. Crush the coke into a particle size close to that of iron filings, take the processed iron filings, and then mix them evenly according to the ratio of iron filings and coke at a ratio of 10:1 (volume ratio), and pack them into a column. The coking wastewater after the secondary biochemical treatment enters the acidification treatment tank, where concentrated H 2 SO 4 Adjust the pH of the solution to about 2, let it settle, and the supernatant enters the flocculation tank, and add flocculant FeCl at 2.5g / L 3 , set aside to settle, and the supernatant enters the high-level water tank in a countercurrent manner, that is, the water enters from the bottom of the column and the water exits from the upper part, and the flow rate of t...

Embodiment 3

[0029] Example 3: Take some scrap iron filings, soak them with dilute sulfuric acid to remove oxides on their surfaces, then soak them in dilute NaOH solution to remove oil stains on their surfaces, and then fully wash the iron filings with clean water. Crush the coke into a particle size close to that of iron filings, take the processed iron filings, and then mix them evenly according to the ratio of iron filings and coke at a ratio of 10:1 (volume ratio), and pack them into a column. The coking wastewater after the secondary biochemical treatment enters the acidification treatment tank, where concentrated H 2 SO 4 Adjust the pH of the solution to about 3.5, let it settle, and the supernatant enters the flocculation tank, and add flocculant FeCl at 5g / L 3 , set aside to settle, and the supernatant enters the high-level water tank in a counter-current manner, that is, water enters from the bottom of the column, and the water exits from the upper part, and the flow rate of the...

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Abstract

The invention provides a method for advanced treatment of coking wastewater, mainly solving problems existed in the prior technology, such as complex treatment processes, ineffectiveness, and difficulty in meeting a discharging standard. The method is characterized by comprising the following major steps: step one, packing a column, that is, first soaking iron scraps by using a dilute sulfuric acid and a dilute NaOH solution separately, smashing coke, mixing uniformly the iron scraps and the coke with a volume ratio of 10:1, and packing the mixture into an iron-carbon column; step two, carrying out an acidizing treatment on the coking wastewater which has gone through a two-stage biochemical treatment; step three, adding a flocculating agent into the acidized wastewater; step four, carrying out a column chromatography treatment, during which the liquid flows into the iron-carbon column from the bottom portion and flows out from the upper portion; step five, precipitating after carrying out a neutralizing treatment; and step six, repeating operations in step two to step five on supernate obtained in step five. The method for advanced treatment of coking wastewater provided by the invention has the advantages of simple equipment needed in implementation, convenient operation, good effect, quick effectiveness, cheap and easily available drugs and reagents, low cost in operation of the device, and high practicability.

Description

technical field [0001] The invention relates to a method for advanced treatment of coking wastewater applied in the field of sewage environmental protection treatment. Background technique [0002] Coking wastewater is wastewater generated during the process of coal coke, gas purification and coking product recovery. The wastewater is characterized by high concentrations of COD and ammonia nitrogen, and contains a large amount of inorganic salts such as ammonium salts, sulfides, and cyanides, and the organic components are complex, mainly including phenolic compounds, polycyclic aromatic compounds, heterocyclic compounds, and fatty compounds. compounds, and the concentration of pollutants is high, which belongs to biodegradable organic wastewater. Coking wastewater generally needs to be discharged through primary pretreatment, secondary biochemical treatment and advanced treatment. At present, after coking wastewater undergoes secondary biochemical treatment, the concentr...

Claims

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Application Information

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IPC IPC(8): C02F9/06
Inventor 林立君苑庆山朱天玉徐鑫
Owner NORTHEAST GASOLINEEUM UNIV
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